- Xu, H-I., Tadauchi, O. 2008
- The subgenera Margandrena, Leimelissa, Stenomelissa and Zonandrena of the genus Andrena of eastern Asia (Hymenoptera, Andrenidae). Fac. Agr., Kyushu Univ. 53: 63-66.
- Xu, H-L. and Tadauchi, O. 2012
- A Revision of the Subgenus Andrena of the Genus Andrena of Eastern Asia (Hymenoptera: Apoidea: Andrenidae). Journal of the Faculty of Agriculture, Kyushu University 57(1): 97-114.
- Xu, H.-l. and Tadauchi, O. 2002
- A revision of the subgenus Chlorandrena of the genus Andrena of Eastern Asia (Hymenoptera, Andrenidae). ESAKIA 42: 55-73.
- Xu, H.-l. and Tadauchi, O. 2011
- A Revision of the Subgenus Plastandrena of the Genus Andrena, of Eastern Asia (Hymenoptera : Apoidea : Andrenidae). Journal of the Faculty of Agriculture 56(1): 63-66.
- Xu, S., Schlüter, P.M. and Schiestl, F.P. 2012
- Pollinator-driven speciation in sexually deceptive Orchids. International Journal of Ecology: 1-9.